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<p>[QUOTE=&quot;desertgem, post: 636149, member: 15199&quot;]There seems to be a lot more of this happening by NCG and also the other main TPG companies. Perhaps tightening is intentional in order to avoid having to reimburse coins currently graded as NT at the price premium that later might be determined scientifically to be AT. The threads on CU forum about some AT coins being more subject to changing than NT during the submission/slabbing process got me to considering the process. I recall a couple here where there were claims that the toning was changed in the weeks it was&nbsp; being&nbsp; graded. </p><p><br /></p><p>The below is completely hypothetical, and reflect my wandering brain.:goofer:</p><p><br /></p><p>&nbsp;&nbsp; If it is possible that AT even using the same chemical processes, produces less stable ( more energetic bonding) toning products, such differences might be measurable using non-destructive methods. If I was a TPG, I would be investigating these processes strongly in hopes of accuracy. If I knew such testing was over the horizon, it would be financially better to reject even slightly questionable toning until such a procedure was in place. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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